报告题目：Real-world applications of Quartz-Enhanced Photo Acoustic gas sensing

报告人： Prof. Vincenzo Spagnolo (Technical University of Bari)

报告时间：2019年4月12 日星期五下午3:00-4:00

报告地点：激光光谱研究所三层报告厅

报告简介：

Demands of trace gas sensing systems from industrial, petrochemical and environmental monitoring, and biomedical applications are wide-ranging and include emission monitoring and leak detectors, explosive material sensors and breath analyzers. Several chemical and optical techniques have been proposed and the optimum choice always depends on the gas species involved, the gas concentration range, the required spectral resolution, the sensitivity, the specificity, the response time, the operating environment, the size and the cost. Optical sensors that have proved to be effective for trace gas detection can be divided in three major groups: i) direct absorption-based sensors; ii) cavity-enhanced based sensors; iii) photoacoustic (PAS) and photothermal based sensors. The main strengths of the photoacoustic spectroscopy (PAS) are that no optical detectors are needed, and sound wave detectors are wavelength insensitive. Quartz-enhanced photoacoustic spectroscopy (QEPAS) is an alternative approach to photoacoustic detection which employs a quartz tuning fork (QTF) as an acoustic wave transducer. The short optical pathlength and capability to reach high detection sensitivity represent the main distinct advantages that make QEPAS the leading-edge technique mature for out-of-laboratory operation and open field detection.

Here it will be described examples of real-world applications exploiting QEPAS technique for trace-gas sensing. Results obtained by exploiting novel QEPAS configurations, like intracavity-QREPAS and/or new generation of custom QTFs will be reviewed. Finally, examples of “nearly” commercial QEPAS sensing systems, will be described.

报告人简介：

Vincenzo Spagnolo obtained the PhD in physics in 1994 from University of Bari. He works at the Technical University of Bari as Full Professor of Applied Physics. He is the director of the joint-research lab PolySense created by Technical University of Bari and THORLABS GmbH. His research interests include optoacoustic gas sensing and spectroscopic techniques for real-time device monitoring. His research activity is documented by more than 180 Scopus publications and two filed patents. He has given more than 50 invited presentations at international conferences and workshops. Prof. Spagnolo is program committee member of several SPIE and OSA conferences. He is editor of Journal of Sensors (Hindawi) and Applied Science (MPDI) and external editor for Sensors journal (MPDI). Prof. Spagnolo is Fellow member of the SPIE and senior member of OSA and “hundred-talent” professor at Shanxi University, Taiyuan (China).